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Define Basic probability set theory

Fifty raffle tickets are numbered 1 through 50 as well as one of them is drawn at random. describe the probability that the number is a multiple of 5 or 8? Consider the subsequent ‘solution' Since 10 tickets bear numbers that are multiples of 5 and 6 tickets bear numbers that are multiples of 8 we concluded the required probability is as follows.

10/50 + 6/50 = 16/50

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